Furnace.



PATENTED AUG. 30, 1904.

B. HAMILTON.

2 EHEETS-SHEET 1.

H0 MODEL.

Wiigesses @l llforgeys PATENTED AUG. 30, 1904.

B. HAMILTON.

FURNACE.

APPLICATION FILED DEC. 30, 1903.

2 SHEETS-SHEET 2.

N0 MODEL.

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EESEEEQSE 61 Brad r 4 @jqlforge ys UN TED Y STATES Patented August 30, 190%.

BRADFIELD HAMILTON, OF FOSTORIA, OHIO.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 768,851, dated August 30, 1904.

Application filed December 30,1903. $erialNo.18'7,218. (No modeL) ple and inexpensive, will possess a maximum heating capacity and Will thoroughly utilize the combustible content of the fuel, so that the products of combustion which escape to the chimney will carry with them a minimum amount of waste heat.

A further object of the invention is to provide in a furnace of this character improved means for supplying air to the combustionchambcr in order to render more effective the combustion of the gaseous constituents of the fuel.

A further object of the invention is to provide a furnace of this type with an improved arrangement of draft devices by means of which the draft of the furnace may be maintained through a circuitous route in order to impart a large amount of heat to the radiat' ing-surfaces or made direct from the combustion-chamber to the chimney at Will.

I make use of the novel construction and combination of par-ts of a furnace'li ereinaf'ter fully described, illustrated ii preferred form in the accompanying drawings, and having the novel features thereof specifically pointed out in the appended claims, it being understood that changes in' the form, proportions,

and exact mode of assemblage of the elements exhibited may b'e,resorted to without departing from the spirit of the invention or sacriiicing the advantages thereof.

In the drawings, Figurel is a view in side elevation of" the improved furnace. Fig. 2 is a longitudinal sectional view of the same. Fig. 3 is a front elevation. Fig. at is a horizontal sectional view. Fig. 5 is a sectional detail view taken on the plane indicated by the line 5 5 in Fig. 2.

Referr ng to the drawings, in which corresponding parts are designated .by similar characters of reference throughout the several views, 1 designates an approximately rectangular casing comprising an upper firebox 2 and combustion-chamber 8, communicating with the fire-box at the bottom, and a lower ash-pit hthe ash-pit being separated from the combustion-chamber and fire-box by a horizontally-disposed grate 5, which consists, preferably, of a single casting undercut at the rear and longitudinally-movable upon supporting-ledges 6. Above the fire-box and combustion-chamber is a dome 7 separated from the fire-box and combustion-chamber by a plate 8, having a plurality of openings therein, as shown, The outer surface of the casing l at the sides of the fire-box and combustion-chamber is provided with radiating ribs or ridges 9, and, similar ribs or ridges are provided upon the exterior of the dome 7, which is securely bolted through the casing 1, as shown in l. The fire-box 2 and combustion-chamber 3 are partially separated by a curved back plate 10, supported upon projecting brackets 11, formed upon the inner surface of the side walls of the. casing 1, and

a narrow passage 12 is left between the lower margin of the back plate 10 and the upper surface of the grate 5. The grate 5 is arranged for longitudinal sliding movement, as In attaining the ObJGCEWHbOVB enumerated" above stated, and is consequently a little shorter than the casing l 'the rear end of the grate being normallyhi contact with the end Wall of the casing T, as shown in Fig. 2, and

the forward end of the grate being spaced a short distance from the front wall of the casing. -Toprevent the passage of fuel through ,the opening between the end of the grate and clevis 1 1, pivoted at the front of the grate, a shaking-bar 15, adapted for engagement with said clevis, and a socket 16, adapted to receive the lower end of the shaking-bar to afford a fulcrum therefor. mechanism above mentioned is in use to effect the discharge of ashes from the grate, the clevis is turned inward against the end of the grate, so that the door 17, leading into the ash-pit, may be closed; but when it is desired to shake the grate the door 17 is opened and the clevis is swung outward into the position shown in Fig. 2, so that the shaking-bar may be passed downward through the eye at the free end of the clevis and introduced into the socket 16.

The products of combustion are usually allowed to pass from the gaseous combustionchamber 3, at the rear end of the casing 1, into the space between the circular drum 18 and the surrounding drum 19. The drum 18 and its support are ordinarily cast in one piece, as shown in Fig. 1, and the drum 19 is secured in a groove or channel provided therefor at the rim of the support of the drum 18. At the top of the drum 18 and drum 19 is a plate 20, having a central opening, which is disposed over the interior of the drum 18 and openings or passages 2O at the rear of the plate, separated by a cross-bar 20 which permit the products of combustion to pass upward from the drum 18 and the drum 19 into an annular space between an inner drum 21. and an outer drum 22, concentric therewith, both of which drums are supported upon the upper surface of the plate 20. The annular space between the drums 21 and 22 is closed at the top by an annulus 23, secured in position, as shown in Fig. 2, and the products of combustion pass from said annular space through a smoke-pipe 24 to a drum 25, mounted above the dome 7 and connected with said dome by means of a thimble 26, provided on the top of the drum and having a damper 27 pivoted therein, as shown in Fig. 2. 2T operated by means of a rod 28, extending to the front of the furnace and provided with a hand-wheel 29. From the drum 25 the smoke passes through a pipe 30, which extends upon a very slight upward incline to the chimney. (Not shown.)

In order to facilitate the combustion of the gases in the chamber 3, at the rear of the firebox, air-conduits 31 are arranged at the sides of the lire-box, as shown in Figs. 1 and 2, these conduits being provided at their outer ends with closures 32 and discharging at their inner ends into the chamber 3. WVhen the furnace is in operation, the current established by the passage of the products of combustion into the space between the drum 18 and the drum 19 draws air through the conduits 31. at a rate determined by the strength of the draft and the amount of opening permitted at the outer ends of said conduits.

Except when the The clam per.

W'hen passing through the conduits 31, the air necessarily comes into contact with the high lyheated side walls of the ire-box, and when the air passes into the chamber 3 it is heated to such a high temperature that it greatly facilitates combustion in the chamber and causes the complete consumption of the smoke and carbon monoxid which pass into the combustion-chamber from the fire-box.

To permit the use of the furnace for heating water, if desired, water-pipes 33 are arranged in the heated dome 7, as best seen in Figs. 1 and 3, and the cleaning of the drums and flues of the furnace is permitted by removable caps 34, fitted in annular flanges 35, projecting from the rear surface of the drum 22 and the forward surface of the drum 25.

A door 36 is provided at the front of the lire-box, as usual, and in the top of the door 17 of the ash-pit is provided a pivoted flap 37, by means of which the draft from beneath the fire-b0x may be controlled.

From the foregoing descri 'ition and the drawings illustrative thereof itwill be clearly evident that the furnace is simple and comparatively inexpensive in construction, that it presents amaximum of radiating-surface. and that the supply of air to the lire-box and combustion-chamber is so arranged that all the heating effect of the fuel may be obtained.

In order to secure the full heating effect from the furnace, the draft from the lire-box and combustion-chamber will be maintained through the circuitous passage around the drums 18 and 21 and thence through the pipe 24 and the drum 25; but when it is desired to produce a quick and effective draft the damper 27, between the dome 7 and the drum 25, will be opened, and direct draft from the fire-box .to the drum 25 and smoke-pipe 30 will be produced.

Having thus described the construction and operation of my invention, what I claim as new, and desire to secure by Letters Patent,

a furnace, a ire-box, a grate therein,

supporting-brackets formed interiorly upon the walls ofsaid lire-box, a curved back plate supported upon'said brackets and spaced from the grate which forms the bottom of the lire-' box, air-Hues disposetl exterior of and constituted partly by the walls of the lire-box and opening into the gas-con bustion chamber in rear of the curved back plate, radiating means for conveying the products from said gas-combustion chamber to a point of. exit.

2. In a furnace, a lire-box, a ate therein, brackets formed interiorly upon the side walls of the fire-box, a curved back plate. supported upon said bracket and spaced from the grate which constitutes the bottom of the fire-box, thus forming a constricted passage connecting the lower portion of said fire-box with the gascombustion chamber separated from the lireboX by the curved back plate, radiating-drums disposed behind said gas-con'ibustion chamber and communicating therewith through an opening substantially midway between the bottom and the top of said combustion-chamber, and means for supplying hot air to theupper portion of said combustion-chamber.

3. In a furnace, a fire-box, a radiating-dome above said fire-box and having openings in the floor thereof to afford communication with said fire-box, a smoke-drum above said dome connected by suitable lines with said fire-box, and a damper disposed between said drum and said dome, whereby directdraft maybe established from said fire-box through said dome to said drum.

4. In a furnace, a fire-box, a rear drum arranged behind said lire-box and communicating with the same and extending upward therefrom, a front drum located above said fire-box, a pipe connecting said drums, and a smoke-pipe extending rearward from the front drum.

5. In a furnace, at fire-box, a rear drum arranged behind said fire-box and communicating therewith, said drum extending upward above the top of said fire-box, a front drum located above said fire-box and connected with the rear drum, and a smoke-pipe extending rearward from the upper part of said front drum over said rear drum.

6. In afurnace, a fire-box, a gas-combustion chamber behind said fire-box and communicating therewith, a rear drum behind said gascombustion chamber and communicating therewith, said rear drum having a central vertical opening and being composed of inner and outer shells spaced apart to afford a passage for the products of combustion, plates connecting the shells at the top and bottom, a horizontal diaphragm mounted in the space between the inner and outer shells at a point above the opening through which products of combustion pass from the gas combustion chamber, said diaphragm being provided with openings at the back of the drum, a front drum above the fire-box connected with the upper portion ofthe rear drum, and a smokepipe leading rearward from said front drum.

In testimony that I claim the foregoing as my own I have hereto afiixed my signature in the presence of two witnesses.

BRADFIELD HAMILTON.

Witnesses:

RAY M. LANCE, A. GEORGIA. 

